Improveivient in bolt-heading machines



.end elevation, and Fig.

llivrrnn Sra-res Farnwr @marca L. L. DAVIS, OF LAGONIA, NEW HAMPSHIRE.

IMPROVEMENT IN BOLT-HEADING MACHINES.

Specification forming part of Letters Patent No: 52,393, dated February 6, 1866.

AF0 all whom it may concern:

Be it known that I, L. L. DAVIS, of Laconia, in the county ot' Belknap and State of New Hampshire, have invented a new and useful Improvement in Bolt- Heading Machines; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specication, in which- Figure lis a side elevation, Fig. 2 is an 3 is a perspective view, of said improved bolt-heading machine. Fig. 4 is a plan of the same. Figs. 5 and 6 are, respectively, a plan and side view of the band,77 so called. Figs. S and 9 are, respectively, a plan and side view ofthe cam and' weighted lever which control the jaws of the machine. Figs. 10, l1, and l2 represent the foot or hub on which rests the end of the'bar of iron'which is to be headed down in the machine.

Similar letters refer to like parts in all the drawings.

The drawings represent a bolt-heading machine of the following construction: The upright pieces A and B constitute the jaws of the machine, the upright B being movable, and turning upon the pin b in the shoulder a of the standard A. rIhe band H supports the cam C, which is actuated bythe weighted handle L, and isv used for closing the jaws. The powerful spring S opens the jaws when the position ofthe cam allows such opening. The screws s s hold the band H in place, and the set-screw s can be used to counteract any wearing of the cam and consequent loosening of the jaws.

rIhe inner face of the upright standard A is serrated, all the teeth being made uniform.

A slot, O, extends nearly from the upper toi the lower end of the standard A, and receives the shank of the sliding foot or hub F.

The foot or hub F is T-shaped, having the top, however, wider as well as longer than the shank. The under face of this top is serrated to match the serrated face of A, and an aperture, D, in the shank receives the wedgeshaped pin G, which holds the foot in any desired position.

The construction above described is substantially the same as that set forth in'an application for Letters Patent filed in the United States Patent Office by Alvah Tucker of Gilford, in said county of Belknap, and now pending, and I expressly disclaim the invention of any part of said machine as hereinbefore described.

My improvement consists in forming dies' l d d d in the upper faces of A and B, and in forming upon or in or in attaching to the side of the upright standard A an adjusting scale, I K.

The form of the dies shown in the drawings is that of a semi-hexagon for fabricating that form of bolt-head generally denominated sixsquare,7 but the dies maybe made of any shape desired. Each size of die extends to the center line of the face of the standards, two sizes being placed in the same right line for economy of space.

Sets of polygonal or other dies, called sows,7 are in common use in blacksmith shops as separate tools, and no novelty is claimed in the mere use of such dies or sets of dies.

The scale I K is designed for setting the sliding foot F at any point desired for forming bolts of a given length. It may becast in or upon the side of the standard, or be made separate and attached thereto, or formed by engraving or painting the same thereon.

The construction of the dies is by casting the uprights with the depressions and finishing up the depressions into exact dies, or by casting the standards with a plane face and cutting out the dies by suitable means; also, by forming the dies ot` cast-steel, and by iianges upon this plate of dies, or by other means, casting the standards upon and adherent to said plates of dies. I prefer, for ordinary purposes, the lirst-described method of construction.

The advantages of constructing the dies upon the upper faces of the uprights A and B are the convenience and economy of time reA sulting from combining in one machine all (or as many as possible) ot' the tools used in forming any article 5 also, in the better quality of bolts produced by having the dies in conthem, for the purposes and in the manne nection with the headingmachine; also, in substantially as set forth.

cheapness and simplicity of construction. 2. The combination, with the bolt-heading What I claim 'as my invention, and desire machine herein described, of an adjustingto secure by Letters Patent, isscale, substantially as set forth.

l. Constructing one or more grooves, chan- Witnesses: L. L. DAVIS. nels, or dies in the upper faces ot' the stand- J. P. BUCKLAND, ards A and B, herein described, or either of ALLEN FAIRFIELD. 

